61. Li Yundi is talented on music. He is a f_______ Chinese pianist.

　Not many people have seen icebergs. Sailors(船员) sometimes see them but they 　51　 　to keep away from them. We call the top and bottom of the world the South and North Poles(南北极). Here there is ice over the sea and the 　52　 . The ice is often thousands of meters thick. The ice often moves slowly down 　53　 　the sea. Then big pieces of ice break off and float(漂浮) on the sea. We　 　54 　　these big pieces of ice “icebergs ”.

　Most of an iceberg is under the water. Ice is only a little 　55　 　than water. The top of an iceberg may not be near 　56　 　a ship, 　57　 　the ship hits the iceberg below the water.Then the ship　 58 　.Sometimes the water becomes　 　59　 . The bottom of the iceberg becomes smaller and smaller. Then it turns right over. Sometimes it hits a ship. Icebergs are often very beautiful but they are also 　60　 .　

We know that trees are useful in our everyday life. They 　21　 us many things, such as wood,

oxygen(氧气),rubber, medicines and many other　 　22 　.They can 　23　 　tell us a lot about our climate(气候).The following are the reasons:

If you 　24　 　a tree, you can see that it 　25　 many rings(年轮).Most trees grow one new ring　　 26　 　year. Because of this reason , we know 　27　 　a tree is. A tree over a hundred years old 　28 　　that it has more than a hundred 　29　 .When the climate is dry or very cold, the trees do not grow very much and their rings are usually 　30　 .When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very 　31　 ,this means that the climate 　32 　changed. If we 　33　 　the rings on this tree, we can learn about the 　34　 　for a hundred years. We can see 　35　 our climate is changing today.

21.A.tell　 　　　　 　　 　 B. ask　 　 　　　　 　C. give　 　　　　　 　　D. get

22. A. years　　　　 　B. things　　　　　 　C. trees　　　 　　D. reasons

23. A. not　 　　 　　B. too 　　 　　　C. to 　 　　　 　　D. also

24.A.cut across 　 　B. climb up 　　　　　 　 C. walk past 　 　D. look at

25. A. is　　　　　 　B. has　　　　　　　 　C. was　　　　 　　D. will be

26. A. every 　 　　B. many 　　　　　　 　 C. the first　 　　　　 D. from

27. A. how big　 　　B. how long　　　　　 　 C. how old　 　　　 D. how much

28. A. takes　　　　　 　B. means　　　　　 　C. gets　　　　 　D. begins

29. A .trees　　　　　　　 B. leaves　　　　　　　　　　 C. people　　　　　 D. rings

30. A. big　　　　　　 B. thick　　　　　　　　　 C. small　　　　　 D. thin

31. A. long　　　　　 B. short　　　　　　 C. thick　　　　 　D. heavy

32. A. suddenly　 　 　B. happily　　　　 　 　C. hardly　　　 　D. kindly

33. A. look for　　　　 B. look at　　　　 　C. look up　　 　　D. look out

34. A. people　　　　　 B. things　　　　　 　C. climate　　 　D. life

35. A. how 　　　　　　 B. why　　　　　　　　 　C. when 　　 　 　D. while

20．--What _____ did you do?　　

-- I hung out with my friend and took some photos.

A. else　　　 　　B. other　　　 　　　C. more　　 　　　　D. the other

19. I like talking with others. But Tom doesn’t. He often reads books. So Tom is 　　　than I am.

A. funnier 　 　　B. more outgoing　　　 　C. wilder　　　　　　　　 D. calmer

18. In my class, 85% students ride bikes to school. So 　　　　students get to school by bike.

A. all　　　　　　　　 　B. more　　　　　　　　　　 　C. most　　　　　　　 　　 D. a few

17. --- Must we clean the classroom now?　　　

---No, you _______.　　　 A. mustn't 　　　　B. may not 　　　　C. can't 　　　　　　D. needn't